Skip the auto shop - Our mechanics make house calls

Q: When vehicle getting hot it starts to idle higher to 1200 rpm

asked by on

My Ford battam 2005 13 idle higher as it getting hot. Idling starts at 1000rpm and go up to 1200

My car has 120000 miles.
My car has a manual transmission.

Hey there. This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold that monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed.

However, when the engine RPM drops below the normal range of 800 RPM (for most cars), it is more than likely that you are dealing with an IAC valve problem. In cases where this valve is clogged or is failing, your vehicle will stall instead of slowing to an idle after the release of the throttle. This may also be related to a cold start enrichment issue as well. When the engine intake air temperature reaches a certain level of heat, the computer will automatically change the air/fuel mixture to adapt to this change in air density. I would recommend having an expert from YourMechanic come to your home to replace your idle air control valve.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Low rpm & stalling

This is often times related to what is called an idle air control module which regulates the air flow at idle as the air enters the intake system and is mixed with fuel before being injected into the motor. When...

Q: How do you adjust the power front seat?

Depending on the trim level of your car, you may have a power front seat rather than a manual seat. This offers more customization in terms of seating position, as well as less effort required to adjust the seat. Here’s...

Q: Car over heats

Hi there: The overheating issue may be caused by air bubbles trapped inside the cooling system. The fact that you're receiving that vacuum sound when you open the radiator cap indicates that you've got some air trapped in the system....

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.